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Load Sharing Mechanism Across Graft-Bone Interface in Static Cervical Locking Plate Fixation

Authors
 In Ho Han  ;  Sung Uk Kuh  ;  Dong Kyu Chin  ;  Byung Ho Jin  ;  Yong Eun Cho  ;  Keun Su Kim 
Citation
 Journal of Korean Neurosurgical Society, Vol.45(4) : 213-218, 2009 
Journal Title
 Journal of Korean Neurosurgical Society 
ISSN
 2005-3711 
Issue Date
2009
Keywords
Cervical vertebrae ; Spinal fusion ; Surgical Fixation Devices
Abstract
OBJECTIVE: This study is a retrospective clinical study over more than 4 years of follow up to understand the mechanism of load sharing across the graft-bone interface in the static locking plate (SLP) fixation compared with non-locking plate (NLP). METHODS: Orion locking plates and Top non-locking plates were used for SLP fixation in 29 patients and NLP fixation in 24 patients, respectively. Successful interbody fusion was estimated by dynamic X-ray films. The checking parameters were as follows : screw angle (SA) between upper and lower screw, anterior and posterior height of fusion segment between upper and lower endplate (AH & PH), and upper and lower distance from vertebral endplate to the end of plate (UD & LD). Each follow-up value of AH and PH were compared to initial values. Contributions of upper and lower collapse to whole segment collapse were estimated. RESULTS: Successful intervertebral bone fusion rate was 100% in the SLP group and 92% in the NLP group. The follow-up mean value of SA in SLP group was not significantly changed compared with initial value, but follow-up mean value of SA in NLP group decreased more than those in SLP group (p=0.0067). Statistical analysis did not show a significant difference in the change in AH and PH between SLP and NLP groups (p>0.05). Follow-up AH of NLP group showed more collapse than PH of same group (p=0.04). The upper portion of the vertebral body collapsed more than the lower portion in the SLP fixation (p=0.00058). CONCLUSION: The fused segments with SLP had successful bone fusion without change in initial screw angle, which was not observed in NLP fixation. It suggests that there was enough load sharing across bone-graft interface in SLP fixation.
Files in This Item:
T200901225.pdf Download
DOI
10.3340/jkns.2009.45.4.213
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Neurosurgery (신경외과학교실) > 1. Journal Papers
Yonsei Authors
Kuh, Sung Uk(구성욱) ORCID logo https://orcid.org/0000-0003-2566-3209
Kim, Keun Su(김근수) ORCID logo https://orcid.org/0000-0002-3384-5638
Cho, Yong Eun(조용은) ORCID logo https://orcid.org/0000-0001-9815-2720
Chin, Dong Kyu(진동규) ORCID logo https://orcid.org/0000-0002-9835-9294
Jin, Byung Ho(진병호)
Han, In Ho(한인호)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/103835
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